Low-Cost, Low-Power, Low-Dropout,

SOT23-3 Voltage References

10

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Detailed Description

The MAX6001–MAX6005 bandgap references offer a

temperature coefficient of <100ppm/°C and initial accura-

cy of better than 1%. These devices can sink and source

up to 400µA with <200mV of dropout voltage, making

them attractive for use in low-voltage applications.

Applications Information

Output/Load Capacitance

Devices in this family do not require an output capaci-

tance for frequency stability. They are stable for capac-

itive loads from 0 to 2.2nF. However, in applications

where the load or the supply can experience step

changes, an output capacitor will reduce the amount of

overshoot (or undershoot) and assist the circuit’s tran-

sient response. Many applications do not need an

external capacitor, and this family can offer a signifi-

cant advantage in these applications when board

space is critical.

Supply Current

The quiescent supply current of these series-mode ref-

erences is a maximum of 45µA and is virtually indepen-

dent of the supply voltage, with only a 0.8µA/V variation

with supply voltage. Unlike shunt-mode references, the

load current of these series-mode references is drawn

from the supply voltage only when required, so supply

current is not wasted and efficiency is maximized over

the entire supply voltage range. This improved efficien-

cy can help reduce power dissipation and extend bat-

tery life.

When the supply voltage is below the minimum speci-

fied input voltage (as during turn-on), the devices can

draw up to 200µA beyond the nominal supply current.

The input voltage source must be capable of providing

this current to ensure reliable turn-on.

Output Voltage Hysteresis

Output voltage hysteresis is the change in the output

cycled over its entire operating temperature range.

Hysteresis is caused by differential package stress

appearing across the bandgap core transistors. The

typical temperature hysteresis value is 130ppm.

Pin Description

NAME

FUNCTION

1

IN

Supply Voltage Input

2

OUT

Reference Voltage Output

PIN

3

GND

Ground

Figure 1. Positive and Negative References from Single +3V or +5V Supply

IN

OUT

+REF OUTPUT

OUTPUT

-REF OUTPUT

10nF

1M, 0.1%

1M, 0.1%

GND

MAX6001

MAX6002

MAX6003

MAX6004

MAX6005

V+

GND

MAX681

V-

V+

V-

ICL7652